Site Profiles - View. General Information. Contaminants: Site Hydrology:

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1 Site Profiles - View General Information Site Name and Location: Description: Historical activity that resulted in contamination. Former Sun State Supply, Inc. Orlando, Florida, United States Sun State Supply was a drycleaning wholesale supplier that operated at this site from 1985 to The facility occupied a portion of a warehouse at the site. PCE was stored in a 4000 gallon AST which received bulk deliveries via tank truck. The solvent was then transferred to 5-gallon containers for delivery to drycleaners. Contaminants: Contaminants: Contaminants present and the highest amount detected in both soil and groundwater (please avoid giving ranges). Other Contaminants Present: Indicates what other contaminants were found on-site Deepest 44 ft BLS Significant Groundwater Contamination: Plume Size: 1000 ft x 300 ft x 44 ft Site Hydrology: Contaminant Conc in GW Conc. in Soil Tetrachloroethene (PCE) 12,000 ug/l 250 ug/kg Trichloroethene (TCE) 17 ug/l (1 of 5)2/2/2006 1:38:03 PM

2 Depth to Groundwater: Lithology and Subsurface Geology: Conductivity: Gradient: Media: Media: ft BLS Surface-44 ft BLS:(surficial aquifer) silty, fine to mediumgrained sand; ft BLS (intermediate aquifer) clay; ft BLS: silty, fine to medium-grained sand with clay & phosphate nodules Upper surfical: 25/ft/day, lower surficial: 5 ft/day ft/ft Groundwater Soil Remediation Scenario: Cleanup Goals: Technologies: Technologies Used: Groundwater: PCE = 3 ug/l, TCE = 3 ug/l Soil: PCE = 30 ug/ Kg Ex Situ: Air Stripping Chemical Oxidation Pump and Treat Other technologies used: Why the technology was selected: Date implemented: The contaminant plume was actively migrating both laterally and vertically at the site due to construction and operation of a stormwater retention pound on the property adjacent to the site. Pump & treat was selected to contain the contaminant plume. Chemical oxidation was implemented after nearly three years of operation of the pump & treat system to expedite groundwater remedation by destroying most of the remaining contaminant mass. Pump & Treat: April 17, 2001 Potassium Permanganate Injection: January (2 of 5)2/2/2006 1:38:03 PM

3 Final remediation design: Pump & Treat: One 6-inch diameter schedule 40 PVC recovery well (screened ft BLS) was installed. A Grunfos 1/2 HP submersible pump was installed. Design pumping rate is 10 gpm. Anticipated drawdown is 8 feet. Water is pumped to a 500-gallon holding tank. A 1/2 HP Myers transfer pump routes the water to a low-profile air stripper with a 2 HP centrifugal blower. A 1/2 Hp Myers transfer pump routes the treated water to a 5 ft x 50 ft x 5 ft infiltration gallery. Since the recovery well is located downgradient of the former Sun State property approximately 450 feet of one-inch diameter Schedule 40 PVC pipeline was installed through a horizontally drilled borehole to transport produced water back to the treatment compound. Results and Next Steps: Results to date: The pump & treat system was taken off line on January 27, 2005 prior to the injeciton of KMnO4. The system operated at an average pumping rate of approximately 8 to 9 gpm. Approximately 17,400,000 of groundwater were recovered and treated. An estimated 14.6 pounds of VOCs were recovered. System VOC influent concentrations had dropped a high of 220 ug/l to 9.6 ug/l. In September of 2003, two 2-inch diameter Schedule 40 PVC injection wells were installed (screened ft BLS0 in the downgradient portion of the contaminant plume. Approximately 16,500 gallons of KMnO4 solution (1,700 pounds of KMnO4 mixed with makeup water pumped from one of the recovery well) were injected over a two-day period at a rate of from 5 to 10 gpm. Next Steps: Costs: Cost for Assessment: Cost to Design and Implement: Groundwater monitoring conducted on May 27, 2005 showed drops in PCE concentrations in the two monitor wells located nearest the injection wells: MW013 from 69 ug/l to 4.4 ug/l; MW014 ft: from 540 ug/l to < 1.0 ug/l. Pending the results of the next groundwater monitoring event, an additional injection event or resumption of pump & treat operations will be recommended. $ 115,800 Pump & Treat: $ 288,400 Chemical Oxidation: $ 43,100 (3 of 5)2/2/2006 1:38:03 PM

4 Cost for Operation and Maintenance: Total Costs for Cleanup: $ 171,400 (includes monitoring) Lessons Learned: Lessons Learned: 1. Groundwater mounding associated with the stormwater impoundment on the adjacent property appears to have caused the contaminant plume to mobilize. 2. The membrane interface probe proved to be an effective tool for defining the distribution of the predominant poriton of the contaminant mass. This information was used to select screen intervals for the injection wells to insure that the potassium permanganate contacted the areas of the contaminant plume with the highest contaminant concentrations. Contacts: Principal Point of Contact: Judie Kean, Environmental Manager Bureau of Waste Cleanup (MS4520) Florida Department of Environmental Protection Tallahassee, Florida Phone: (850) Judie.Kean@dep.state.fl.us Site Specific References: Mike Lodato, PG, consultant GeoSyntec Consultants Riveredge Drive, Suite 300 Tampa, Florida Phone: (823) mlodato@geosyntec.com (4 of 5)2/2/2006 1:38:03 PM

5 Site Specific References: Contamination Assessment Report: October 1997 Contamination Assessment Report Addendum: February 2000 Remedial Action Plan (Pump & Treat) Remedial Action Plan (Chemical Oxidation): September 2004 O&M Reports: Images: Images of Site: Profile last updated on Sep 13, (5 of 5)2/2/2006 1:38:03 PM